Two Sydney Trains staff say they have suffered electric shocks on the new South West Rail Link, prompting accusations the Baird Government is failing to ensure quality standards in its huge infrastructure construction program.

The separate incidents occurred on January 12 and 14, and have forced the closure of platforms at the new Leppington stabling yards.

Train drivers must enter cabs using stairs on the non-platform side, and toot their horn before moving a train, after the Ground Based Warning System, which flashed lights to warn of a train's approach, was also disabled because of concern it wasn't earthed during construction.

According to a Sydney Trains memo issued to staff, a female staff member was taken to hospital after receiving an electric shock when using the warning system.

The memo said the second incident, believed to be an electric shock by the worker, was a burn caused by "leaning on metal on a hot day".

"Crew must not enter any of the cordoned off areas or touch the lights in this area until you receive further instructions," the memo warns.

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Another memo on January 20 states: "It has become apparent that some light poles and crew platforms were not electrically insulated well enough from earth as required by design."

Contractor John Holland is now investigating thousands of wires and will report back to Sydney Trains at the end of February.

The South West Rail Link is the first infrastructure project completed by the Baird Government, which boasted it was delivered a year early, and $300 million under budget, when services began in February 2015.

But six months later, speed restrictions were imposed on a stretch of the 11 kilometre line between Leppington and Glenfield, after cracks in the line were noticed. Ballast settlement was blamed.

"The Government's rhetoric about infrastructure is betrayed by their delivery," he said.

"They've still got speed restrictions on a brand new railway line because of construction inadequacies. Not installing electricity systems properly can have catastrophic consequences. What's happened here is simply not good enough."

Sydney Trains chief executive Howard Collins said Sydney Trains was "aware of some minor electrical issues at the Leppington stabling yard and are addressing these as a matter of priority".

He said procedures for staff had been adjusted to ensure their safety.

"Rectifications issues like these are commonplace for major pieces of infrastructure. We monitor them closely and work to iron them out. At no stage has there been a risk to customer safety, service reliability or journey times."

The electric shock was attributed to water entering a switch during heavy rain.